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From Wikipedia:

Nettie Stevens

Nettie Maria Stevens was an early American geneticist credited with the discovery of sex chromosomes. In 1905, soon after the rediscovery of Mendel's paper on genetics in 1900, she observed that male mealworms produced two kinds of sperm, one with a large chromosome and one with a small chromosome. When the sperm with the large chromosome fertilized eggs, they produced female offspring, and when the sperm with the small chromosome fertilized eggs, they produced... Read More

BornNettie Maria Stevens
July 7, 1861
Cavendish, Vermont, United States
DiedMay 4, 1912 (aged 50)
Baltimore, Maryland, United States
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